E66.811 Obesity, class 1

✓ Billable ICD-10-CM 2026
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The ICD-10-CM code for Obesity, class 1 is E66.811 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Section
E65-E68: Overweight, obesity and other hyperalimentation (E65-E68)
Category E66
14 codes (10 billable)
FY2026 Status
Introduced in FY2025

Also Known As

ICD-10-CM Alphabetic Index entries that lead to E66.811:

  • Obesity › class › 1

Official Coding Guidelines

Diabetes mellitus (TOC entry)

a. Diabetes mellitus ................................................................................................................... 39

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.4.a
Obesity (TOC entry)

b. Obesity .................................................................................................................................. 42

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.4.b

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Related Codes

Parent Code

E66 Overweight and obesity

Related Codes in E66

E66 Overweight and obesity E66.0 Obesity due to excess calories E66.01 Morbid (severe) obesity due to excess calories E66.09 Other obesity due to excess calories E66.1 Drug-induced obesity E66.2 Morbid (severe) obesity with alveolar hypoventilation E66.3 Overweight E66.8 Other obesity E66.81 Obesity class E66.812 Obesity, class 2 E66.813 Obesity, class 3 E66.89 Other obesity not elsewhere classified E66.9 Obesity, unspecified
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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